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43. Model Creation and Response Prediction of a Countersunk Bolted Composite Joint Using Enhanced CB2ATA Toolkit

NEETHI SIMON, XIANG REN, EUGENE FANG and JIM LUA

Abstract


Countersunk bolted joints have been used extensively in bolted composite connections because of their improved aerodynamics benefits compared to protruding-head fasteners. The complex shape of countersunk fasteners has been found to lead to damage initiation at the location of the sharp edge. Most current studuies have been focussed on a single critical bolt without considering the evolution of load transfer from the surroudiung bolts resulting from non-linear response and damage progression. Given the challenge in creation of an analysis model for a bolted composite system with multiple countersunk bolts, an efficient modeling strategy has been developed within our existing composite bolted and bonded analysis toolkit for Abaqus (CB2ATA) for automatic mesh generation and insertion of multiple contact surfaces for a conuntersunk bolted compoiste system. An illustrative example based on a single lap joint with three countersunk bolts is used to demonstrate the process of model creation, contact evaluation, and response prediction of the bolted compoosite system.


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